1 Introduction
2 References
3 Power supply methods
3.1 Power supply from central office
3.1.1 Metallic transmission
3.1.2 Optical transmission
3.2 Local power supply
3.2.1 Metallic transmission
3.2.2 Optical transmission
3.3 Individual power supply
3.3.1 Metallic transmission
3.3.2 Optical transmission
4 Power sources for usual operation
4.1 Power company
4.2 Generator
4.3 Battery
5 Power wiring
5.1 Individual power cable
5.2 Superimposition method
5.3 Composite cable (combined power and communication cable)
6 Power sources for backup
6.1 Generator
6.2 Battery
7 Environment for each equipment
7.1 Temperature condition
7.2 Humidity
7.3 Others
Appendix I